EXPERIMENTAL STUDY ON TENSILE PROPERTIES OF CFRP GRIDS UNDER THE COUPLING OF SEAWATER IMMERSION AND STRESS
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摘要: 为研究海洋腐蚀环境下碳纤维复材(CFRP)网格拉伸力学性能的变化规律,开展了海水环境下不同初始应力水平和不同海水浸泡老化时间下CFRP网格单肢拉伸性能试验。结果表明:CFRP网格表面侵蚀程度随老化时间增加,表面颜色变深,失去基体原有光泽,变得粗糙;破坏模式由前期大部分试件的拉断破坏到后期的炸裂破坏,在高应力水平下(0.6fu),个别试件出现分层破坏,破坏现象更加明显。此外,在海水中浸泡360 d后,应力水平为0、0.3fu和0.6fu的CFRP网格抗拉强度保留率分别为89.8%、87.7%和79.8%,弹性模量保留率分别为96.4%、95.0%和92.9%;表明应力的存在加速了网格强度的退化,且随着应力水平的提高,CFRP网格抗拉强度和弹性模量的退化更加明显。Abstract: In order to study the change law of the tensile mechanical properties of CFRP (Carbon Fiber Reinforced Polymer) grids in marine corrosive environment, a single-limb tensile performance test of CFRP grids with different initial stress levels in seawater environment was carried out. The results show that the degree of surface erosion of the CFRP grid increases with aging time, the surface color becomes darker, the original gloss of the matrix is lost, and it becomes rough; the failure mode is from the tensile failure of most specimens in the early stage to the burst failure in the later stage. At the level of (0.6 fu), individual specimens showed layered damage, and the damage was more obvious. In addition, after immersed in seawater for 360 days, the retention rates of tensile strength of CFRP grids with stress levels of 0, 0.3 fu and 0.6 fu were 89.8%, 87.7% and 79.8%, respectively, and the retention rates of elastic modulus were 96.4% and 95.0% and 92.9%, respectively. Indicating that the presence of stress accelerates the degradation of the mesh strength, and as the stress level increases, the degradation of the tensile strength and elastic modulus of the CFRP mesh becomes more obvious.
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Key words:
- CFRP grid /
- seawater immersion /
- stress level /
- tensile strength /
- elastic modulus
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